Hi Dave,

Thanks for the info.  Was wondering about the main spring width...its hard
to judge from the photo; and where you got such
and the ~ cost?  The photo spring looks to be a original coil strip or a
good home shear.  I understand (via the web) its
magnetic; but apparently it works fine regardless of the boom end
coil/magnet actuator feedback influence.

Midway atop your vertical mechanism there appears to be a screw adjustable
mass balance or centering counterweight.

I presume....that the main spring period is adjusted via the back clamp
alone.

The very small size of the vertical is rather startling for the ~ giant ~
mechanisms we're used too seeing on PSN.
I can't really tell if their is more added mass to the boom via the photo's
besides the ~ frame, coil, capacitance plate.

What did you use for the coil?  Homebrew wound or otherwise a commerical
coil?

What is the magnet, ring ceramic or neodymium?

Take care, Meredith Lamb


On Fri, Aug 14, 2009 at 12:12 PM, Dave Nelson  wrote:

>  Hi Meredith,
>
> The spring is 17-7  stainless condition C heat treated to condition CH900.
> Thickness is 12 mils.  The pivots are 2 mil stainless single axis .  Pivot
> length is only about 12 mils. They are held  tension by the C spring. A two
> axis pivot is not necessary.
>
>
> Dave
>
>
>
>
>
>
Hi Dave,
=A0
Thanks for the info.=A0 Was wondering about the main spring width...it=
s hard to judge from the photo; and where you got such
and the ~ cost?=A0 The photo spring looks to be a original coil strip =
or a good home shear.=A0 I understand (via the web) its
magnetic; but apparently it works fine regardless of the boom end coil=
/magnet actuator feedback influence.=A0
=A0
Midway atop your vertical mechanism there appears to be a screw adjust=
able mass balance or centering=A0counterweight.
=A0
I presume....that the main spring period is adjusted via the back clam=
p alone.=A0 
=A0
The very small size=A0of the vertical is rather=A0startling for the ~ =
giant ~ mechanisms we're used too seeing on PSN.
I can't really tell if their is more added mass to the boom via th=
e=A0photo's besides the ~ frame, coil,=A0capacitance plate.
=A0
What did you use for the coil?=A0 Homebrew wound or otherwise a commer=
ical coil?
=A0
What is the magnet, ring ceramic or neodymium?
=A0
Take care, Meredith Lamb
=A0
=A0
On Fri, Aug 14, 2009 at 12:12 PM, Dave Nelson <davefnelson@.......> wrote:



Hi Meredith,
=A0
The spring is 17-7=A0 stainless condit=
ion C heat treated to condition CH900. Thickness is 12 mils. =A0The pivots =
are 2 mil stainless single axis=A0.=A0 Pivot length is only about 12 mils. =
They are held=A0 tension by the=A0C spring. A two axis pivot is not necessa=
ry.

=A0

=A0
Dave 
=A0
=A0

=A0